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2 Sheets-Sheet 1.

(No Model.)

A. W. EICHELBERGBR. CHAIR.

Iatented July 10, 1883.

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- (No Model.) Sheets-Sheet 2.

A. W. EIOHELBERGER. 2

CHAIR. N0. 281,038. Patented July 10, 1883.

r C I 0' c 0 :1 5 Z 3 e e UNIT D STATES 'ATENT Fries.

ABDIEL W. EIOHELBERGER, OF' HANOVER, PENNSYLVANIA, ASSIGNOR OF ONEHALF TO J. YVIR-T FORNEY, OF SAME PLACE.

CHAIR.

SPECIFICATION forming part of Letters Patent No. 281,038, dated July 10, 1883.

Application filed March 8, 1883. (No model.)

To all whom it may concern Be it known that I, ABDIEL W. EIcHEL- BERGER, a citizen of the United States, residing at Hanover, in the county of York and State of Pennsylvania, have invented certain new and useful Improvements in Chairs, of which the following is a specification.

My invention is designed to produce a chair capable, first, of vertical elevation and dero pression; secondly, of a rotary or revolving motion; and, thirdly, of a rocking movement while at any stage of elevation or revolution. The invention is adapted for office or house use, as a parlor-car chair, or for any other purpose to which a chair of this class is applicable. In the accompanying drawings, Figure l is a vertical section of my improved chair. Fig. 2 is a plan view of the elevating-platform and rocker-base. Figs. 3 and 4 are views of detached parts of the invention; and Figs. 5, 6,

and 7 show modifications, as hereinafter described.

Similar letters of reference indicate similar parts in the respective figures.

A is the support for the entire chair. the elevating-platform and rocker-base. the superstructure or chair proper.

The support or tripod A is centrally perforated and provided with a threaded nut, a, inserted vertically therein.

The elevating-platform B has a screw, 1), which enters the nut a, said screw being secured centrally of the platform B by means of a collar, b, within which the upper end of the screw 2) rests. The collar 1) is maintained in position by means of braces b, secured to the collar and to the sides of the platform B, as shown. The sides 0 of the platform B are longitudinally curved, to constitute convex seats for the rockers of the chair proper. On the inner side of each of the rockers c of the chair is secured a box, (2, withinwhich is placed a spiral spring, d, the upper end of the spring projecting through the top of -the box, and being formed into aloop, through which passes a pin, (1. The lower end of the spring d is also formed into a loop, the loop connecting with a screw-eyebolt, 6. At the under part of each of Bis C is

the sides 0 of the platform B is a perforated plate,

6, through which the screw-eyebolt c is passed, a thumb-nut, 6, being placed upon the end of the screw, whereby the tension of the spring d maybe adjusted and the rockingchair held to the elevating-platform or rocker-base with the desired degree of force. The upper end of the screw 1) projects through the top of the collar b, and a torsion-spring,f, shown as 0011- sisting of a steel bar square in cross-section, is passed through the top of the screw and across the platform B. The respective ends of the bar are held in metallic platesf", secured to the inner sides of the boxes (I.

The action of the chair is apparent. The chair proper and the platform or rocker-base B may be elevated or depressed upon the screw b as a center, and the chair proper rocked upon the platform B at any stage ofits elevation or point in its revolution. It will be seen that the chair may not only be rocked back from a perpendicular line, but forwardan advantage which is important where a person is sitting at a desk and wishes to lean forward over the desk.

I do not restrict myself to the abovc-described arrangement of spiral. springs for con necting the rocking-chair to its platform or base, nor to the described adjustment of torsional spring.

In Fig. 5 is shown a double-spiral-spring-afi taclnnent for holding the rocking-chair to the elevating-pl atform In Fig. 6 the spiral-spring device is dis' carded and a double torsional attachment used.

At each end of the steel bar or torsional spring is secured an arm connected bv means of 8' a 7 t a a link, y, to a rocker of the chair proper. his attachment serves the same double purpose as is effected by the employment of the double spring construction shown in Fig. 5. A guardplate, g, may be secured to the inner part of 0 each of the sides of the elevating-platform B,

to aid in maintaining the proper relations between the rocker of the chair and its platform or support.

- In Fig. 7 is shown a modified form of double 9 5 spiral spring. h en the rocker is thrown back, the spring (2* is compressed by means of the two rods cl", running through. the buttons (1. When the rockingchair is thrown-forward, the spring d is expanded. The action of the two springs keeps the rocking-chair constantly in position and prevents it from goingforward or backwardbeyond the proper limits.

If desired, a rubber or other elastic spring or springs, h, may connect the forward part of the rockingchair with the front of the elevating-platform, whereby to more effectually prevent any undue backward movement. Such provision, however, I deem unnecessary.

I am aware that heretofore spiral or tensile springs have been used to connect rockers to their stands, and to afford a rocking or backward and forward movement, and also that such tensile springs have been made adjustable. I therefore disclaim the invention generally of adjustable tensile springs for this use; andI do notclaim herein the combination of torsional and tensile springs; butsuch combinascrew, the ends of the spring being secured in plates attached to the respective inner sides of the chair proper, substantially as set forth. I11 testimony whereof Ihereto sign my name in the presence of two witnesses.

ABDIEL W. EIOHELBERGER.

Witnesses:

O. W. FORNEY, L. F. MELSHEIMER. 

